SYSOP3%uhavax.decnet@uhasun.hartford.edu (11/08/90)
Everyone, I am looking for guidance in the resurection of an old Marantz model 8B pwoer amp. The unit is operational however the right channel's 8 ohm tap has gone bad. Having little experience in audio electronics it appears as though faulty winding in a transformer is the culprit. I was wondering if anyone in Net-Land could give me advice on finding parts. The next question that comes to mind concerns some behavioral glitches the unit demonstrates during operation. The Unit plays well once warmed and is never driven very hard. (music is played at conversation level) I have noticed however a tendancy for the amp to "overheat". ( I say this as I am of the actual problem) Twenty minutes or so of operation will result in an almost linear digression of the volume of lower frequencies until ulitmately the right channel will dip in decibles entirely. A few seconds in front of a small fan however will cure the problem however. Is this problem related to the fact that I am runing the wrong impedance. My speakers are rated with an 8ohm impedance, However I am using the 4 ohm taps on the amplifier. Any suggestions would be greatly appreciated. eric truntz. sysop3@uhavax